Python prototype for Solana MetaMask proxy

Built on https://github.com/abhinavsingh/proxy.py.git

Requirements (for Ubuntu 18.04):

• python3
• python3-venv
• python3-dev
• gcc

To run internal implementation for Ethereum tokens, start the proxy with:

python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
python3 -m proxy --hostname 127.0.0.1 --port 9090 --enable-web-server --plugins proxy.plugin.NeonRpcApiPlugin --num-workers=1

Then add network http://localhost:9090/solana into MetaMask

The repository contains sources for several services with similar logic:

• proxy
• indexer
• gas-tank

GasTank is a service that analyzes transactions with NeonEVM instructions and looks for liquidity transfers into Neon accounts. The service provides users that make such transfers with gas-less transactions.

The service is configured via environment variables. Further to the common proxy environment, the service accepts the following variables:

• FAUCET_URL

URL to the faucet service for distributing NEON tokens to the users

• INDEXER_ERC20_WRAPPER_WHITELIST

A comma-separated list of ERC20ForSpl wrapped tokens for transfer (those transactions which trigger the service to allow gas-less transactions). The gas-tank looks for the first transfers of such tokens from Solana to Neon (those transfers that lead to the creation of Neon accounts).

• PORTAL_BRIDGE_CONTRACTS

A comma-separated list of Portal Bridge contracts.

• PORTAL_BRIDGE_TOKENS_WHITELIST

  An allow list of tokens for the transfer which will trigger the providing of gas-less transactions. This set should contain "tokenChain:tokenAddress", where:

  • tokenChain is an original token chain number in terms of Portal bridge numbers
  • tokenAddress is the address of the token in hexadecimal lowercase form with a '0x' prefix

  Alt: provide the ANY value to accept any token.

• ERC20_BRIDGE_CONTRACTS

A comma-separated list of Common ERC20 Bridge contracts.

• ERC20_BRIDGE_TOKENS_WHITELIST

An allowlist of tokens whose transfer triggers the providing of gas-less transactions. This set should contain ERC20 addresses separated by a comma. Alt: provide the ANY value to accept any token.

Gotchas

• PORTAL_BRIDGE_CONTRACTS & PORTAL_BRIDGE_TOKENS_WHITELIST should both be specified. If either is missed, the gas-tank doesn't analyze Portal Bridge transfers.

• ERC20_BRIDGE_CONTRACTS & ERC20_BRIDGE_TOKENS_WHITELIST should both be specified. If they are missed, the gas-tank doesn't analyze Common ERC20 Transfers.